org.gcube.indexmanagement.geo.ranking

Class RankEvaluator

java.lang.Object

org.gcube.indexmanagement.geo.ranking.RankEvaluator

All Implemented Interfaces:

Comparator<DataWrapper>

public abstract class RankEvaluator
extends Object
implements Comparator<DataWrapper>

The base class for all RankEvaluators

Field Summary

Fields

Modifier and Type	Field and Description
protected InclusionType	containmentMethod The containment method used in the query
protected GeoIndexType	indexType The index type of the Index using this RankEvaluator
protected Polygon	polygon The query polygon
protected com.vividsolutions.jts.geom.Envelope	query The query Minimal Bounding Rectangle
protected boolean	reverseSort An indicator of whether the sorting should be reversed

Constructor Summary

Constructors

Constructor and Description
RankEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
int	compare(DataWrapper data1, DataWrapper data2)
void	init(Polygon polygon, InclusionType containmentMethod, Boolean reverseSort, GeoIndexType indexType, String[] args) A method called by the GeoIndexResource after creating an instance of a RankEvaluator
protected abstract void	initialize(String[] args) The plugin specific initialization method.
abstract boolean	isIndexTypeCompatible(GeoIndexType indexType) A method used to check if this RankEvaluator plugin is compatible with indices/entries with a specific GeoIndexType
abstract double	rank(DataWrapper data) A method used to rank a GeoIndex entry.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Field Detail

polygon

protected Polygon polygon

The query polygon

query

protected com.vividsolutions.jts.geom.Envelope query

The query Minimal Bounding Rectangle

indexType

protected GeoIndexType indexType

The index type of the Index using this RankEvaluator

containmentMethod

protected InclusionType containmentMethod

The containment method used in the query

reverseSort

protected boolean reverseSort

An indicator of whether the sorting should be reversed

Constructor Detail

RankEvaluator

public RankEvaluator()

Method Detail

compare

public final int compare(DataWrapper data1,
          DataWrapper data2)

Specified by:

compare in interface Comparator<DataWrapper>

init

public final void init(Polygon polygon,
        InclusionType containmentMethod,
        Boolean reverseSort,
        GeoIndexType indexType,
        String[] args)
                throws RankEvaluatorInitializationException

A method called by the GeoIndexResource after creating an instance of a RankEvaluator

Parameters:

polygon - - A polygon representation of the original query of which this RankEvaluator will rank the results

containmentMethod - - The containment method used in the original query

reverseSort - - An indicator of whether the rank evaluator should sort the results in reverse

indexType - - The geo index type of the GeoIndex using this RankEvaluator

args - - Any additional plugin specific initialization arguments.

Throws:

RankEvaluatorInitializationException - - An error occurex while initializing the RankEvaluator

initialize

protected abstract void initialize(String[] args)
                            throws RankEvaluatorInitializationException

The plugin specific initialization method. Initializes an instance of a RankEvaluator plugin using an array of Strings. All other initialization methods have been completed when this method is called, so it can make use of any of the standard RankEvaluator instance variables.

Parameters:

args - - A plugin specific array of Strings used to initialize a RankEvaluator plugin.

Throws:

RankEvaluatorInitializationException - - An error occurex while initializing the RankEvaluator

isIndexTypeCompatible

public abstract boolean isIndexTypeCompatible(GeoIndexType indexType)

A method used to check if this RankEvaluator plugin is compatible with indices/entries with a specific GeoIndexType

Parameters:

indexType - - The GeoIndexType of which to check the compatability with this plugin

Returns:

TRUE if this RankEvaluator plugin is compatible with indices/entries with the specified GeoIndexType

rank

public abstract double rank(DataWrapper data)

A method used to rank a GeoIndex entry. A value between 0 and 1 is encouraged, but not obligatory.

Parameters:

data - - The GeoIndex entry to rank.

Returns:

the rank of the specified GeoIndex entry.